打印*等边三角形和累加运算

来源：互联网发布：php与python 编辑：程序博客网时间：2024/04/30 14:44

public class EqualLineTriangle {

    /**
    * @author ray
    * @param null
    */

    /*
    *输出结果：1+1/1.0*2.0+1/2.0*3.0+1/3.0*4.0+1/4.0*5.0+1/5.0*6.0+1/6.0*7.0+1/7.0*8.0+1/8.0*9.0+1      /9.0*10.0+1/10.0*11.0+1/11.0*12.0 = ?
    */
    public void prinSM(){
        double sum = 1.00;
        for(double i=1.00000;i<12.00000;i++){
            sum = sum + 1/(i*(i+1));
            sb.append("+1/"+i+"*"+(i+1));
        }
        System.out.println("/n"+sb.toString()+" = "+sum);
    }

    /*
    *输出结果：任意长的等边三角形
    */
    public void printTriangle(int LineLen){
        StringBuffer sb = new StringBuffer();
        for(int i=0;i<LineLen;i++){
            for(int j=0;j<LineLen-i-1;j++){
                sb.append(" ");
            }
            for(int j=0;j<i*2+1;j++){
                sb.append("*");
            }

            sb.append("/n");
        }
    }

    /*
    *主函数
    */
    public static void main(String[] args) {
        EqualLineTriangle el = new EqualLineTriangle();
        el.prinSM();
        el.printTriangle(5);
    }

}